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[thirdparty/binutils-gdb.git] / gdb / config / ns32k / tm-umax.h
1 /* Definitions to make GDB run on an encore under umax 4.2
2 Copyright 1987, 1989, 1991, 1993 Free Software Foundation, Inc.
3
4 This file is part of GDB.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21 /* This is also included by tm-ns32km3.h, as well as being used by umax. */
22
23 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
24
25 /* Need to get function ends by adding this to epilogue address from .bf
26 record, not using x_fsize field. */
27 #define FUNCTION_EPILOGUE_SIZE 4
28
29 /* Offset from address of function to start of its code.
30 Zero on most machines. */
31
32 #define FUNCTION_START_OFFSET 0
33
34 /* Advance PC across any function entry prologue instructions
35 to reach some "real" code. */
36
37 extern CORE_ADDR umax_skip_prologue PARAMS ((CORE_ADDR));
38 #define SKIP_PROLOGUE(pc) (umax_skip_prologue (pc))
39
40 /* Immediately after a function call, return the saved pc.
41 Can't always go through the frames for this because on some machines
42 the new frame is not set up until the new function executes
43 some instructions. */
44
45 #define SAVED_PC_AFTER_CALL(frame) \
46 read_memory_integer (read_register (SP_REGNUM), 4)
47
48 /* Address of end of stack space. */
49
50 #ifndef STACK_END_ADDR
51 #define STACK_END_ADDR (0xfffff000)
52 #endif
53
54 /* Stack grows downward. */
55
56 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
57
58 /* Sequence of bytes for breakpoint instruction. */
59
60 #define BREAKPOINT {0xf2}
61
62 /* Amount PC must be decremented by after a breakpoint.
63 This is often the number of bytes in BREAKPOINT
64 but not always. */
65
66 #define DECR_PC_AFTER_BREAK 0
67
68 #if 0 /* Disable until fixed *correctly*. */
69 #ifndef INVALID_FLOAT
70 #ifndef NaN
71 #include <nan.h>
72 #endif /* NaN */
73
74 /* Return 1 if P points to an invalid floating point value. */
75 /* Surely wrong for cross-debugging. */
76 #define INVALID_FLOAT(p, s) \
77 ((s == sizeof (float))? \
78 NaF (*(float *) p) : \
79 NaD (*(double *) p))
80 #endif /* INVALID_FLOAT */
81 #endif
82
83 /* Say how long (ordinary) registers are. This is a piece of bogosity
84 used in push_word and a few other places; REGISTER_RAW_SIZE is the
85 real way to know how big a register is. */
86
87 #define REGISTER_SIZE 4
88
89 /* Number of machine registers */
90
91 #define NUM_REGS 25
92
93 #define NUM_GENERAL_REGS 8
94
95 /* Initializer for an array of names of registers.
96 There should be NUM_REGS strings in this initializer. */
97
98 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
99 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
100 "sp", "fp", "pc", "ps", \
101 "fsr", \
102 "l0", "l1", "l2", "l3", "xx", \
103 }
104
105 /* Register numbers of various important registers.
106 Note that some of these values are "real" register numbers,
107 and correspond to the general registers of the machine,
108 and some are "phony" register numbers which are too large
109 to be actual register numbers as far as the user is concerned
110 but do serve to get the desired values when passed to read_register. */
111
112 #define R0_REGNUM 0 /* General register 0 */
113 #define FP0_REGNUM 8 /* Floating point register 0 */
114 #define SP_REGNUM 16 /* Contains address of top of stack */
115 #define AP_REGNUM FP_REGNUM
116 #define FP_REGNUM 17 /* Contains address of executing stack frame */
117 #define PC_REGNUM 18 /* Contains program counter */
118 #define PS_REGNUM 19 /* Contains processor status */
119 #define FPS_REGNUM 20 /* Floating point status register */
120 #define LP0_REGNUM 21 /* Double register 0 (same as FP0) */
121
122 /* Total amount of space needed to store our copies of the machine's
123 register state, the array `registers'. */
124 #define REGISTER_BYTES \
125 ((NUM_REGS - 4) * REGISTER_RAW_SIZE(R0_REGNUM) \
126 + 4 * REGISTER_RAW_SIZE(LP0_REGNUM))
127
128 /* Index within `registers' of the first byte of the space for
129 register N. */
130
131 #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
132 LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
133
134 /* Number of bytes of storage in the actual machine representation
135 for register N. On the 32000, all regs are 4 bytes
136 except for the doubled floating registers. */
137
138 #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
139
140 /* Number of bytes of storage in the program's representation
141 for register N. On the 32000, all regs are 4 bytes
142 except for the doubled floating registers. */
143
144 #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
145
146 /* Largest value REGISTER_RAW_SIZE can have. */
147
148 #define MAX_REGISTER_RAW_SIZE 8
149
150 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
151
152 #define MAX_REGISTER_VIRTUAL_SIZE 8
153
154 /* Return the GDB type object for the "standard" data type
155 of data in register N. */
156
157 #define REGISTER_VIRTUAL_TYPE(N) \
158 (((N) < FP0_REGNUM) ? \
159 builtin_type_int : \
160 ((N) < FP0_REGNUM + 8) ? \
161 builtin_type_float : \
162 ((N) < LP0_REGNUM) ? \
163 builtin_type_int : \
164 builtin_type_double)
165
166 /* Store the address of the place in which to copy the structure the
167 subroutine will return. This is called from call_function.
168
169 On this machine this is a no-op, because gcc isn't used on it
170 yet. So this calling convention is not used. */
171
172 #define STORE_STRUCT_RETURN(ADDR, SP)
173
174 /* Extract from an array REGBUF containing the (raw) register state
175 a function return value of type TYPE, and copy that, in virtual format,
176 into VALBUF. */
177
178 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
179 memcpy (VALBUF, REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), TYPE_LENGTH (TYPE))
180
181 /* Write into appropriate registers a function return value
182 of type TYPE, given in virtual format. */
183
184 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
185 write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
186
187 /* Extract from an array REGBUF containing the (raw) register state
188 the address in which a function should return its structure value,
189 as a CORE_ADDR (or an expression that can be used as one). */
190
191 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
192 \f
193 /* Describe the pointer in each stack frame to the previous stack frame
194 (its caller). */
195
196 /* FRAME_CHAIN takes a frame's nominal address
197 and produces the frame's chain-pointer. */
198
199 /* In the case of the ns32000 series, the frame's nominal address is the FP
200 value, and at that address is saved previous FP value as a 4-byte word. */
201
202 #define FRAME_CHAIN(thisframe) \
203 (!inside_entry_file ((thisframe)->pc) ? \
204 read_memory_integer ((thisframe)->frame, 4) :\
205 0)
206
207 /* Define other aspects of the stack frame. */
208
209 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
210
211 /* Compute base of arguments. */
212
213 #define FRAME_ARGS_ADDRESS(fi) \
214 ((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
215 ((fi)->frame) : (read_register (SP_REGNUM) - 4))
216
217 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
218
219 /* Get the address of the enter opcode for this function, if it is active.
220 Returns positive address > 1 if pc is between enter/exit,
221 1 if pc before enter or after exit, 0 otherwise. */
222
223 extern CORE_ADDR ns32k_get_enter_addr ();
224
225 /* Return number of bytes at start of arglist that are not really args. */
226
227 #define FRAME_ARGS_SKIP 8
228
229 /* Put here the code to store, into a struct frame_saved_regs,
230 the addresses of the saved registers of frame described by FRAME_INFO.
231 This includes special registers such as pc and fp saved in special
232 ways in the stack frame. sp is even more special:
233 the address we return for it IS the sp for the next frame. */
234
235 extern int umax_frame_num_args PARAMS ((struct frame_info * fi));
236 #define FRAME_NUM_ARGS(fi) (umax_frame_num_args ((fi)))
237 \f
238 /* Things needed for making the inferior call functions. */
239
240 /* Push an empty stack frame, to record the current PC, etc. */
241
242 #define PUSH_DUMMY_FRAME \
243 { register CORE_ADDR sp = read_register (SP_REGNUM);\
244 register int regnum; \
245 sp = push_word (sp, read_register (PC_REGNUM)); \
246 sp = push_word (sp, read_register (FP_REGNUM)); \
247 write_register (FP_REGNUM, sp); \
248 for (regnum = 0; regnum < 8; regnum++) \
249 sp = push_word (sp, read_register (regnum)); \
250 write_register (SP_REGNUM, sp); \
251 }
252
253 /* Discard from the stack the innermost frame, restoring all registers. */
254
255 #define POP_FRAME \
256 { register struct frame_info *frame = get_current_frame (); \
257 register CORE_ADDR fp; \
258 register int regnum; \
259 struct frame_saved_regs fsr; \
260 struct frame_info *fi; \
261 fp = frame->frame; \
262 get_frame_saved_regs (frame, &fsr); \
263 for (regnum = 0; regnum < 8; regnum++) \
264 if (fsr.regs[regnum]) \
265 write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
266 write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
267 write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
268 write_register (SP_REGNUM, fp + 8); \
269 flush_cached_frames (); \
270 }
271
272 /* This sequence of words is the instructions
273 enter 0xff,0 82 ff 00
274 jsr @0x00010203 7f ae c0 01 02 03
275 adjspd 0x69696969 7f a5 01 02 03 04
276 bpt f2
277 Note this is 16 bytes. */
278
279 #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
280
281 #define CALL_DUMMY_START_OFFSET 3
282 #define CALL_DUMMY_LENGTH 16
283 #define CALL_DUMMY_ADDR 5
284 #define CALL_DUMMY_NARGS 11
285
286 /* Insert the specified number of args and function address
287 into a call sequence of the above form stored at DUMMYNAME. */
288
289 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
290 { \
291 int flipped; \
292 flipped = fun | 0xc0000000; \
293 flip_bytes (&flipped, 4); \
294 *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \
295 flipped = - nargs * 4; \
296 flip_bytes (&flipped, 4); \
297 *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \
298 }